Run the install.php script by browsing to http://SERVER-IP/install.php*. When running the wizard, you must ensure the used database is bitnami_multicraft_panel for the Panel, and bitnami_multicraft_daemon for the Daemon.

Once the wizard finishes, delete the install.php file:

$ sudo rm /opt/bitnami/apps/multicraft/htdocs/install.php

After this, you will have successfully upgraded Multicraft to the latest available version.